To assess the probability of detection (by interferometric techniques) of illumination by a coherent source, we characterize the lateral coherence of the off-axis aerosol scattered radiation by applying the van Cittert-Zernike theorem. We find that, for 1.061-microm radiation at a target range of 1 km, the scattered radiation beyond 3.5 cm off axis does not display appreciable lateral coherence.

The purpose of this experiment is to understand the interaction of radiation and matter, and the application to radiation detection and shielding. The inverse square law of the distance is demonstrated with the gamma radiation from Co 60 preparation, the halfvalue thickness and absorption coefficient of various materials determined with the narrow beam system and the corresponding mass attenuat...

Background: Measurement of the radiation dose distribution is important in assessing the health risk a population and serve as reference in documenting changes to environmental radioactivity in soil due to man-made activities. Materials and Methods: The activity concentration of 238U, 232Th and 40K in soil samples obtained from different locations in Ajaokuta Local Government area was measured ...

To realize digital transmission of radiation detection and management information, this paper proposes use of electronic label as information carrier. By means of network, read/write device, and other office hardware and software, cross-region transmission and all-weather free communication of radiation detection and management information can be realized. Market investigation and demonstration...

We find all known contraband detection sensors and instruments to be in some important way imperfect. However, we find that some instruments that use penetrating radiation backscattering for bulk solids detection are viable in the hands of an expert operator/inspector. With this perspective we present a scenario for a staged program to expand and enhance existing detection capability: (1) deplo...

This paper deals with different software based strategies allowing the on-line detection of bit flip errors arising in microprocessor-based digital architectures as the consequence of the interaction with radiation. Fault injection experiments put in evidence the detection capabilities and the limitations of each of the studied techniques. RELATED TOPICS: Radiation effects, fault tolerant syste...

Silicon carbide (SiC) detectors of an Ni/4H-SiC Schottky diode structure and with sensitive areas of 1-4 cm² were fabricated using high-quality lightly doped epitaxial 4H-SiC material, and were tested in the detection of alpha particles and pulsed X-rays/UV-light. A linear energy response to alpha particles ranging from 5.157 to 5.805 MeV was obtained. The detectors were proved to have a low da...

Background: This study set out to evaluate the utility of cerebrovascular virtual non-contrast (VNC) scans. Materials and Methods: Conventional non-contrast (CNC) and dual-energy computed tomography angiography (DE-CTA) head scans were conducted on 100 subjects, of which 46 were normal, 15 had parenchymal hematomas of the brain, 13 had ischemic infarction, 22 had tumors, and 4 had calcified les...

results the diagnostic value of ivu was found positive in 6.5% while it was negative in (93.5%) cases. the sensitivity and specificity of usg, rad and their combination in detection of urolithiasis was calculated as 90.5% and 84.8%, 84.1% and 88.6%; and 98.4% and 4.8% respectively. conclusions ivu can be largely replaced by usg in the pediatric population and if really clinically needed, its in...

As well as being a significant source of environmental radiation exposure, α-particles are increasingly considered for use in targeted radiation therapy. A better understanding of α-particle induced damage at the DNA scale can be achieved by following their tracks in real-time in targeted living cells. Focused α-particle microbeams can facilitate this but, due to their low energy (up to a few M...